Note 9 - Components of Accumulated Other Comprehensive Loss - Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Reclassifications out of unrealized gains and losses on available-for-sale securities:
Realized securities gain, net	$ (101,000)	$ (2,000)	$ (153,000)	$ (5,000)
Income taxes	(35,000)	(1,000)	(54,000)	(2,000)
Realized gain on available-for-sale securities, net of tax, reclassified out of accumulated other comprehensive income	$ (66,000)	$ (1,000)	$ (99,000)	$ (3,000)